Black Rhodium Tank Plating Solution (UK and EU only)

£98.16£364.82 + VAT

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Black Rhodium Tank Plating Solution plates a layer of dark rhodium. Please note that this shade of rhodium is not jet black.

This solution comes ready-to-use and does not need to be diluted with deionised water in order for it to work.

Rhodium concentration: 2 grams per litre.

Orders outside UK and EU

This plating solution cannot be purchased and shipped outside the UK and the EU because it’s part of our range of plating solutions that are regulated for transport.

HS Code: 3824 99 70


The ring on the right has been plated with our black rhodium tank plating solution and been  further enhanced by special treatment after plating.

Our black rhodium tank plating solution is an excellent replacement for other less robust blackening agents.

These silver earrings have been selectively black rhodium and yellow gold plated and then the black rhodium layer has been gently rubbed back with a glass brush, to bring out the textured surface. Unlike other blacking agents, the black rhodium layer won’t rub off so quickly.

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How to use this calculator :

1. In the first box enter the temperature at which you are plating (see Notes below).

2. In the second box, enter the thickness that you want to plate to (see Notes below).

3. In the third box, enter the surface area of the article in square centimetres (cm2).

4. Click the ‘Calculate’ button.

5. Read off the amp setting for your rectifier, the plating time and the volume of replenisher to add before starting the plating sequence.

6. The weight of rhodium plated and the approximate cost of the job is included in the final two readouts.


The solution plates twice as fast at 40 centigrade than at room temperature.

Plated layers in excess of 0.5 microns are very brittle and can be prone to peeling.
We recommend a thickness of between 0.1 and 0.3 microns.

Operating Parameters

Rhodium concentration 2 g/l
Plating Factor 0.02 A/cm2
Plating rate (Plating Factor: 0.02 A/cm2, 20 °C) 0.01 µm/min
Plating rate (Plating Factor: 0.02 A/cm2, 35 °C) 0.031 µm/min
Recommended plating thickness 0.2 micron
Voltage 1-3 volts
pH <1.0
Temperature range 15 – 40 °C
Anode Platinised titanium or MMO (mesh)
Rhodium content in plate 99.1
Blackness L* (CIE Lab measure) Below 50 – 55 (See notes)
Agitation No agitation
Hardness ~400 Hv
Stress (tensile) Very high (brittle)
Special storage requirements None
Shelf life Up to 1 year (without additions)
Health and Safety classification Irritant
Special considerations None
Transport (UN number) 2796



  • Plating rate increases with temperature
  • Coating begins to haze over 0.25 microns
  • Blacker coatings are obtained at lower temperatures.
  • Blackness can be controlled using Black Rhodium Tank Blackening Agent.
  • Deep black coatings (L* < 35) are possible by anodic treatment after plating in Cleaner
    at 3 volts for 1 minute.
    This treatment also vastly improves the layer’s wear and tarnish resistance.
    A protective layer of 0.5 micron of gold should be applied to the object before black
    rhodium plating when performing anodic treatment.
  • Cover the solution when not in use and if not using for a long period of time, store in a closed

Some items are regulated for transport and can only be delivered to destinations in the UK and countries within the EU. Alternative or substitute products are detailed in the ‘Description’ tab of this tabbed panel or under Related Items below this tabbed panel.
For all price quotations for deliveries, please add your items to our shopping cart. You will be able to see the shipping costs by clicking on the ‘Calculate shipping’ button in the cart and before checking out.

Please click on the link below to download the SDS for this product: